webpack/lib/dependencies/CommonJsPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
var ConstDependency = require("./ConstDependency");
var CommonJsRequireDependency = require("./CommonJsRequireDependency");
var CommonJsRequireContextDependency = require("./CommonJsRequireContextDependency");
var RequireResolveDependency = require("./RequireResolveDependency");
var RequireResolveContextDependency = require("./RequireResolveContextDependency");
var RequireResolveHeaderDependency = require("./RequireResolveHeaderDependency");
var RequireHeaderDependency = require("./RequireHeaderDependency");

var NullFactory = require("../NullFactory");

var RequireResolveDependencyParserPlugin = require("./RequireResolveDependencyParserPlugin");
var CommonJsRequireDependencyParserPlugin = require("./CommonJsRequireDependencyParserPlugin");

var BasicEvaluatedExpression = require("../BasicEvaluatedExpression");

function CommonJsPlugin(options) {
	this.options = options;
}
module.exports = CommonJsPlugin;

CommonJsPlugin.prototype.apply = function(compiler) {
	compiler.plugin("compilation", function(compilation, params) {
		var normalModuleFactory = params.normalModuleFactory;
		var contextModuleFactory = params.contextModuleFactory;

		compilation.dependencyFactories.set(CommonJsRequireDependency, normalModuleFactory);
		compilation.dependencyTemplates.set(CommonJsRequireDependency, new CommonJsRequireDependency.Template());

		compilation.dependencyFactories.set(CommonJsRequireContextDependency, contextModuleFactory);
		compilation.dependencyTemplates.set(CommonJsRequireContextDependency, new CommonJsRequireContextDependency.Template());

		compilation.dependencyFactories.set(RequireResolveDependency, normalModuleFactory);
		compilation.dependencyTemplates.set(RequireResolveDependency, new RequireResolveDependency.Template());

		compilation.dependencyFactories.set(RequireResolveContextDependency, contextModuleFactory);
		compilation.dependencyTemplates.set(RequireResolveContextDependency, new RequireResolveContextDependency.Template());

		compilation.dependencyFactories.set(RequireResolveHeaderDependency, new NullFactory());
		compilation.dependencyTemplates.set(RequireResolveHeaderDependency, new RequireResolveHeaderDependency.Template());

		compilation.dependencyFactories.set(RequireHeaderDependency, new NullFactory());
		compilation.dependencyTemplates.set(RequireHeaderDependency, new RequireHeaderDependency.Template());
	});
	compiler.parser.plugin("evaluate typeof require", function(expr) {
		return new BasicEvaluatedExpression().setString("function").setRange(expr.range);
	});
	compiler.parser.plugin("evaluate typeof module", function(expr) {
		return new BasicEvaluatedExpression().setString("object").setRange(expr.range);
	});
	compiler.parser.plugin("assign require", function(expr) {
		// to not leak to global "require", we need to define a local require here.
		var dep = new ConstDependency("var require;", 0);
		dep.loc = expr.loc;
		this.state.current.addDependency(dep);
		this.scope.definitions.push("require");
		return true;
	});
	compiler.parser.plugin("can-rename require", function(expr) {
		return true;
	});
	compiler.parser.plugin("rename require", function(expr) {
		// define the require variable. It's still undefined, but not "not defined".
		var dep = new ConstDependency("var require;", 0);
		dep.loc = expr.loc;
		this.state.current.addDependency(dep);
		return false;
	});
	compiler.parser.plugin("typeof module", function(expr) {
		return true;
	});
	compiler.parser.plugin("evaluate typeof exports", function(expr) {
		return new BasicEvaluatedExpression().setString("object").setRange(expr.range);
	});
	compiler.parser.apply(
		new CommonJsRequireDependencyParserPlugin(this.options),
		new RequireResolveDependencyParserPlugin(this.options)
	);
};